/Engine/Source/Runtime/Engine/Classes/Materials/MaterialExpressionDesaturation.h
class UMaterialExpressionDesaturation : public [UMaterialExpression](API\Runtime\Engine\Materials\UMaterialExpression)
FExpressionInpu...
Fraction
FExpressionInpu...
Input
Outputs: Lerp(Input,dot(Input,LuminanceFactors)),Fraction)
FLinearColor
LuminanceFactors